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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83fdaf7f77012af823e15c042e51942a38277b33d6dffc5408422b7afe7e146' 
  AND token = '8fCqKJ3yMnroie8kA/MFiho8lbrEXNG4DLpOEqBYPYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}